IPv4 R&E Routing Table Report 17:05 GMT Fri 05 Dec, 2025 IPv4 BGP Table (R&E) as seen at ASREN. Report Website: https://bgp.nsrc.org/REN Detailed Analysis: https://bgp.nsrc.org/REN/ASREN/ Analysis Summary ---------------- BGP routing table entries examined: 12843 Prefixes after maximum aggregation (per Origin AS): 7981 Deaggregation factor: 1.61 Unique aggregates announced (without unneeded subnets): 8806 Number of IPv4 prefixes with a valid ROA: 5676 Number of IPv4 prefixes with an invalid ROA: 1 Number of IPv4 prefixes with no ROA: 7166 Total ASes present in the Internet Routing Table: 2054 Prefixes per ASN: 6.25 Origin-only ASes present in the Internet Routing Table: 1770 Origin ASes announcing only one prefix: 842 Transit ASes present in the Internet Routing Table: 284 Transit-only ASes present in the Internet Routing Table: 48 Paths with bogon ASNs present in the IPv4 Routing Table: 0 Average AS path length visible in the Internet Routing Table: 4.6 Max AS path length visible: 14 Max AS path prepend of ASN ( 30116) 10 Prefixes from unregistered ASNs in the Routing Table: 10 Number of instances of unregistered ASNs: 10 Number of 32-bit ASNs allocated by the RIRs: 48152 Number of 32-bit ASNs visible in the Routing Table: 534 Prefixes from 32-bit ASNs in the Routing Table: 1367 Number of bogon 32-bit ASNs visible in the Routing Table: 0 Special use prefixes present in the Routing Table: 0 Prefixes being announced from unallocated address space: 2 Number of addresses announced to Internet: 157046432 Equivalent to 9 /8s, 92 /16s and 86 /24s Percentage of available address space announced: 4.2 Percentage of allocated address space announced: 4.2 Percentage of available address space allocated: 100.0 Percentage of address space in use by end-sites: 99.6 Total number of prefixes smaller than registry allocations: 1281 APNIC Region Analysis Summary ----------------------------- Prefixes being announced by APNIC Region ASes: 3369 Total APNIC prefixes after maximum aggregation: 1757 APNIC Deaggregation factor: 1.92 Prefixes being announced from the APNIC address blocks: 3367 Unique aggregates announced from the APNIC address blocks: 1882 APNIC Region origin ASes present in the Internet Routing Table: 459 APNIC Prefixes per ASN: 7.34 APNIC Region origin ASes announcing only one prefix: 207 APNIC Region transit ASes present in the Internet Routing Table: 43 Average APNIC Region AS path length visible: 4.3 Max APNIC Region AS path length visible: 11 Number of APNIC region 32-bit ASNs visible in the Routing Table: 208 Number of APNIC addresses announced to Internet: 37689696 Equivalent to 2 /8s, 63 /16s and 25 /24s APNIC AS Blocks 4608-4864, 7467-7722, 9216-10239, 17408-18431 (pre-ERX allocations) 23552-24575, 37888-38911, 45056-46079, 55296-56319, 58368-59391, 63488-64098, 64297-64395, 131072-155961 APNIC Address Blocks 1/8, 14/8, 27/8, 36/8, 39/8, 42/8, 43/8, 49/8, 58/8, 59/8, 60/8, 61/8, 101/8, 103/8, 106/8, 110/8, 111/8, 112/8, 113/8, 114/8, 115/8, 116/8, 117/8, 118/8, 119/8, 120/8, 121/8, 122/8, 123/8, 124/8, 125/8, 126/8, 133/8, 150/8, 153/8, 163/8, 171/8, 175/8, 180/8, 182/8, 183/8, 202/8, 203/8, 210/8, 211/8, 218/8, 219/8, 220/8, 221/8, 222/8, 223/8, ARIN Region Analysis Summary ---------------------------- Prefixes being announced by ARIN Region ASes: 5358 Total ARIN prefixes after maximum aggregation: 3242 ARIN Deaggregation factor: 1.65 Prefixes being announced from the ARIN address blocks: 5385 Unique aggregates announced from the ARIN address blocks: 3639 ARIN Region origin ASes present in the Internet Routing Table: 884 ARIN Prefixes per ASN: 6.09 ARIN Region origin ASes announcing only one prefix: 328 ARIN Region transit ASes present in the Internet Routing Table: 116 Average ARIN Region AS path length visible: 5.1 Max ARIN Region AS path length visible: 14 Number of ARIN region 32-bit ASNs visible in the Routing Table: 142 Number of ARIN addresses announced to Internet: 61357184 Equivalent to 3 /8s, 168 /16s and 60 /24s ARIN AS Blocks 1-1876, 1902-2042, 2044-2046, 2048-2106 (pre-ERX allocations) 2138-2584, 2615-2772, 2823-2829, 2880-3153 3354-4607, 4865-5119, 5632-6655, 6912-7466 7723-8191, 10240-12287, 13312-15359, 16384-17407 18432-20479, 21504-23551, 25600-26591, 26624-27647, 29696-30719, 31744-33791 35840-36863, 39936-40959, 46080-47103 53248-55295, 62464-63487, 64198-64296, 393216-402332 ARIN Address Blocks 3/8, 4/8, 6/8, 7/8, 8/8, 9/8, 11/8, 12/8, 13/8, 15/8, 16/8, 17/8, 18/8, 19/8, 20/8, 21/8, 22/8, 23/8, 24/8, 26/8, 28/8, 29/8, 30/8, 32/8, 33/8, 34/8, 35/8, 38/8, 40/8, 44/8, 45/8, 47/8, 48/8, 50/8, 52/8, 54/8, 55/8, 56/8, 63/8, 64/8, 65/8, 66/8, 67/8, 68/8, 69/8, 70/8, 71/8, 72/8, 73/8, 74/8, 75/8, 76/8, 96/8, 97/8, 98/8, 99/8, 100/8, 104/8, 107/8, 108/8, 128/8, 129/8, 130/8, 131/8, 132/8, 134/8, 135/8, 136/8, 137/8, 138/8, 139/8, 140/8, 142/8, 143/8, 144/8, 146/8, 147/8, 148/8, 149/8, 152/8, 155/8, 156/8, 157/8, 158/8, 159/8, 160/8, 161/8, 162/8, 164/8, 165/8, 166/8, 167/8, 168/8, 169/8, 170/8, 172/8, 173/8, 174/8, 184/8, 192/8, 198/8, 199/8, 204/8, 205/8, 206/8, 207/8, 208/8, 209/8, 214/8, 215/8, 216/8, RIPE Region Analysis Summary ---------------------------- Prefixes being announced by RIPE Region ASes: 3168 Total RIPE prefixes after maximum aggregation: 2606 RIPE Deaggregation factor: 1.22 Prefixes being announced from the RIPE address blocks: 3156 Unique aggregates announced from the RIPE address blocks: 2677 RIPE Region origin ASes present in the Internet Routing Table: 570 RIPE Prefixes per ASN: 5.54 RIPE Region origin ASes announcing only one prefix: 261 RIPE Region transit ASes present in the Internet Routing Table: 94 Average RIPE Region AS path length visible: 3.8 Max RIPE Region AS path length visible: 12 Number of RIPE region 32-bit ASNs visible in the Routing Table: 141 Number of RIPE addresses announced to Internet: 56375424 Equivalent to 3 /8s, 92 /16s and 56 /24s RIPE AS Blocks 1877-1901, 2043, 2047, 2107-2136, 2585-2614 (pre-ERX allocations) 2773-2822, 2830-2879, 3154-3353, 5377-5631 6656-6911, 8192-9215, 12288-13311, 15360-16383 20480-21503, 24576-25599, 28672-29695 30720-31743, 33792-35839, 38912-39935 40960-45055, 47104-52223, 56320-58367 59392-61439, 61952-62463, 64396-64495 196608-216475 RIPE Address Blocks 2/8, 5/8, 25/8, 31/8, 37/8, 46/8, 51/8, 53/8, 57/8, 62/8, 77/8, 78/8, 79/8, 80/8, 81/8, 82/8, 83/8, 84/8, 85/8, 86/8, 87/8, 88/8, 89/8, 90/8, 91/8, 92/8, 93/8, 94/8, 95/8, 109/8, 141/8, 145/8, 151/8, 176/8, 178/8, 185/8, 188/8, 193/8, 194/8, 195/8, 212/8, 213/8, 217/8, LACNIC Region Analysis Summary ------------------------------ Prefixes being announced by LACNIC Region ASes: 481 Total LACNIC prefixes after maximum aggregation: 272 LACNIC Deaggregation factor: 1.77 Prefixes being announced from the LACNIC address blocks: 477 Unique aggregates announced from the LACNIC address blocks: 437 LACNIC Region origin ASes present in the Internet Routing Table: 44 LACNIC Prefixes per ASN: 10.84 LACNIC Region origin ASes announcing only one prefix: 19 LACNIC Region transit ASes present in the Internet Routing Table: 14 Average LACNIC Region AS path length visible: 4.4 Max LACNIC Region AS path length visible: 9 Number of LACNIC region 32-bit ASNs visible in the Routing Table: 12 Number of LACNIC addresses announced to Internet: 860992 Equivalent to 0 /8s, 13 /16s and 35 /24s LACNIC AS Blocks 26592-26623, 27648-28671, 52224-53247, 61440-61951, 64099-64197, 262144-274844 + ERX transfers LACNIC Address Blocks 177/8, 179/8, 181/8, 186/8, 187/8, 189/8, 190/8, 191/8, 200/8, 201/8, AfriNIC Region Analysis Summary ------------------------------- Prefixes being announced by AfriNIC Region ASes: 457 Total AfriNIC prefixes after maximum aggregation: 102 AfriNIC Deaggregation factor: 4.48 Prefixes being announced from the AfriNIC address blocks: 456 Unique aggregates announced from the AfriNIC address blocks: 169 AfriNIC Region origin ASes present in the Internet Routing Table: 47 AfriNIC Prefixes per ASN: 9.70 AfriNIC Region origin ASes announcing only one prefix: 27 AfriNIC Region transit ASes present in the Internet Routing Table: 8 Average AfriNIC Region AS path length visible: 5.5 Max AfriNIC Region AS path length visible: 9 Number of AfriNIC region 32-bit ASNs visible in the Routing Table: 31 Number of AfriNIC addresses announced to Internet: 760832 Equivalent to 0 /8s, 11 /16s and 156 /24s AfriNIC AS Blocks 36864-37887, 327680-329727 & ERX transfers AfriNIC Address Blocks 41/8, 102/8, 105/8, 154/8, 196/8, 197/8, APNIC Region per AS prefix count summary ---------------------------------------- ASN No of nets /20 equiv MaxAgg Description 2907 597 2169 463 SINET-AS Research Organization of Informa 7497 453 180 23 CSTNET-AS-AP Computer Network Information 58647 182 18 2 KAGAWAU-AS Kagawa University, JP 4538 171 4161 83 ERX-CERNET-BKB China Education and Resear 7575 165 281 112 AARNET-AS-AP Australian Academic and Rese 55824 152 19 21 NKN-CORE-NW NKN Core Network, IN 6262 63 134 56 CSIRO Commonwealth Scientific and Industr 38280 50 3 2 MONASHUNI-MY-AS-AP Monash University Sunw 132524 42 8 9 TIFR-AS Tata Institute of Fundamental Res 9270 34 3 9 APAN-KR-AS National Infomation Society Ag Complete listing at https://bgp.nsrc.org/REN/ASREN/data-ASnet-APNIC ARIN Region per AS prefix count summary --------------------------------------- ASN No of nets /20 equiv MaxAgg Description 5786 198 16 1 UPRENET, PR 2920 176 34 7 LACOE, US 2152 149 492 98 CENIC-2152, US 18558 137 18 4 NETBLK-RCOEK, US 376 89 150 62 RISQ-AS, CA 21976 88 34 14 NJEDGE-NET, US 1736 79 16 1 MU-AS, US 3477 78 79 37 NOAA-NWAVE, US 22742 70 37 32 CT-EDU-NET, US 81 68 149 29 NCREN, US Complete listing at https://bgp.nsrc.org/REN/ASREN/data-ASnet-ARIN RIPE Region per AS prefix count summary --------------------------------------- ASN No of nets /20 equiv MaxAgg Description 680 283 1883 250 DFN Verein zur Foerderung eines Deutschen 786 213 1739 190 JANET Jisc Services Limited, GB 559 115 533 105 SWITCH Switch, Swiss Academic and Researc 1103 99 1503 84 SURFNET-NL SURFnet, The Netherlands, NL 2614 88 26 68 ROEDUNET, RO 137 82 677 77 ASGARR Consortium GARR, IT 1930 77 88 72 RCCN Fundacao para a Ciencia e a Tecnolog 553 75 366 75 BELWUE BelWue-Koordination, DE 2200 60 630 56 FR-RENATER Reseau National de telecommuni 200521 58 4 27 SEAP-AGE, ES Complete listing at https://bgp.nsrc.org/REN/ASREN/data-ASnet-RIPE LACNIC Region per AS prefix count summary ----------------------------------------- ASN No of nets /20 equiv MaxAgg Description 1916 246 51 127 Rede Nacional de Ensino e Pesquisa, BR 11340 111 25 50 Red Universitaria Nacional, CL 28571 18 40 18 UNIVERSIDADE DE SAO PAULO, BR 52888 14 3 6 UNIVERSIDADE FEDERAL DE SAO CARLOS, BR 278 13 24 9 Universidad Nacional Autonoma de Mexico, 28027 8 2 2 Escuela Superior Politecnica del Litoral, 61468 6 1 5 CEDIA, EC 27817 4 1 4 Red Nacional Academica de Tecnologia Avan 262441 4 4 3 Fund. Vale do Taquari de Educ. e Desenvol 3596 3 0 3 Universidad Autonoma Metropolitana, MX Complete listing at https://bgp.nsrc.org/REN/ASREN/data-ASnet-LACNIC AfriNIC Region per AS prefix count summary ------------------------------------------ ASN No of nets /20 equiv MaxAgg Description 36914 228 82 3 KENET-AS, KE 2561 68 4 34 EUN, EG 37215 39 8 1 MAREN, MW 6879 24 2 9 ENSTINET-, EG 30983 12 4 2 MARWAN-AS, MA 327700 12 16 1 MoRENet, MZ 37654 10 1 6 RwEdNet-AS, RW 327947 5 4 1 KNUST-, GH 327764 4 0 1 SomaliREN, SO 327798 4 0 3 BERNET, BI Complete listing at https://bgp.nsrc.org/REN/ASREN/data-ASnet-AFRINIC Global Per AS prefix count summary ---------------------------------- ASN No of nets /20 equiv MaxAgg Description 2907 597 2169 463 SINET-AS Research Organization of Informa 7497 453 180 23 CSTNET-AS-AP Computer Network Information 680 283 1883 250 DFN Verein zur Foerderung eines Deutschen 1916 246 51 127 Rede Nacional de Ensino e Pesquisa, BR 36914 228 82 3 KENET-AS, KE 786 213 1739 190 JANET Jisc Services Limited, GB 5786 198 16 1 UPRENET, PR 58647 182 18 2 KAGAWAU-AS Kagawa University, JP 2920 176 34 7 LACOE, US 4538 171 4161 83 ERX-CERNET-BKB China Education and Resear Complete listing at https://bgp.nsrc.org/REN/ASREN/data-ASnet Global Per AS Maximum Aggregation summary ----------------------------------------- ASN No of nets Net Savings Description 7497 453 430 CSTNET-AS-AP Computer Network Information Cente 36914 228 225 KENET-AS, KE 5786 198 197 UPRENET, PR 58647 182 180 KAGAWAU-AS Kagawa University, JP 2920 176 169 LACOE, US 18558 137 133 NETBLK-RCOEK, US 55824 152 131 NKN-CORE-NW NKN Core Network, IN 1916 246 119 Rede Nacional de Ensino e Pesquisa, BR 4538 171 88 ERX-CERNET-BKB China Education and Research Net 1736 79 78 MU-AS, US Complete listing at https://bgp.nsrc.org/REN/ASREN/data-CIDRnet List of Unregistered Origin ASNs (Global) ----------------------------------------- Bad AS Designation Net Originated Transit AS Transit AS Name 64011 UNALLOCATED 130.215.0.0/16 10326 WPI, US 396334 UNALLOCATED 205.143.136.0/21 5078 ONENET-AS-1, US 396334 UNALLOCATED 205.143.136.0/24 5078 ONENET-AS-1, US 396334 UNALLOCATED 205.143.137.0/24 5078 ONENET-AS-1, US 396334 UNALLOCATED 205.143.138.0/24 5078 ONENET-AS-1, US 396334 UNALLOCATED 205.143.139.0/24 5078 ONENET-AS-1, US 396334 UNALLOCATED 205.143.140.0/24 5078 ONENET-AS-1, US 396334 UNALLOCATED 205.143.141.0/24 5078 ONENET-AS-1, US 396334 UNALLOCATED 205.143.142.0/24 5078 ONENET-AS-1, US 396334 UNALLOCATED 205.143.143.0/24 5078 ONENET-AS-1, US Complete listing at https://bgp.nsrc.org/REN/ASREN/data-badAS Advertised Unallocated Addresses -------------------------------- Unassigned Network ASN Information AS Name 164.160.192.0/21 Origin: 37661 NRaE1-AS, NG 164.160.192.0/21 Transit: 37288 WACREN, SN 203.9.156.0/24 Origin: 1851 ADELAIDE-UNIVERSITY-AS-AP Adelaide Unive 203.9.156.0/24 Transit: 7575 AARNET-AS-AP Australian Academic and Res Complete listing at https://bgp.nsrc.org/REN/ASREN/data-add-IANA Number of prefixes announced per prefix length (Global) ------------------------------------------------------- /1:0 /2:0 /3:0 /4:0 /5:0 /6:0 /7:0 /8:0 /9:1 /10:1 /11:0 /12:9 /13:15 /14:29 /15:95 /16:1534 /17:279 /18:298 /19:401 /20:543 /21:626 /22:997 /23:1080 /24:6758 /25:52 /26:79 /27:46 /28:0 /29:0 /30:0 /31:0 /32:0 Advertised prefixes smaller than registry allocations ----------------------------------------------------- ASN No of nets Total ann. Description 36914 210 228 KENET-AS, KE 1916 86 246 Rede Nacional de Ensino e Pesquisa, BR 31638 48 48 ASN-LEPIDA, IT 37215 33 39 MAREN, MW 200521 33 58 SEAP-AGE, ES 22742 20 70 CT-EDU-NET, US 36794 19 20 META SOLUTIONS PIKETON, US 3233 18 30 ICI-ROTLD National Institute for Research and Development in Informatics - ICI Bucharest, RO 47623 18 22 IIAP-ASNET-AS, AM 60187 18 39 LGFL-AS, GB Complete listing at https://bgp.nsrc.org/REN/ASREN/data-sXXas-nos Number of /24s announced per /8 block (Global) ---------------------------------------------- 1:1 5:18 8:2 12:1 14:95 23:4 24:2 31:1 35:1 37:26 38:3 40:1 41:71 42:13 44:5 45:26 46:4 47:1 49:13 58:12 59:17 60:6 61:2 62:5 63:3 64:14 65:3 66:19 67:4 68:1 69:13 70:2 72:5 74:12 76:6 77:3 78:3 79:9 80:5 81:27 82:3 83:5 84:6 85:28 86:1 87:1 89:16 91:33 93:14 94:2 95:1 96:5 98:2 101:2 102:12 103:289 104:68 108:2 109:1 111:3 114:1 116:7 118:32 119:30 121:15 122:8 123:8 124:42 128:33 129:35 130:83 131:42 132:17 133:158 134:86 136:197 137:42 138:10 139:4 140:29 141:1 142:28 143:11 144:20 145:13 146:99 147:14 148:9 149:11 150:7 151:8 152:66 153:12 154:18 155:26 156:126 157:7 158:28 159:116 160:33 161:22 162:11 163:65 164:10 165:4 167:9 168:13 169:5 170:12 173:5 175:7 177:1 179:3 180:15 182:2 184:15 185:35 187:4 188:20 191:2 192:1149 193:293 194:85 195:88 196:9 197:180 198:311 199:190 200:171 201:2 202:346 203:189 204:305 205:69 206:116 207:197 208:10 209:67 210:104 211:2 212:41 213:4 216:49 217:22 219:6 222:2 223:6 End of report